/*
    This file is part of the substandard lisp implementation of Standard Lisp
    Copyright (C) 2011 Nicky Nickell

    substandard lisp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

function std_add1(a, env) {
  var u = a[0];

  if (u.type == TYPE_INTEGER) {
    return new lisp_integer(u.value.next());
  } else {
    return new lisp_floating(u.value + 1);
  }
}

/*---
name: add1
arity: 1
rest: false
ftype: FTYPE_EXPR

argument-types:
  - CLASS_NUMBER

doc: |
  explaining what add1 is / how it is used!

tests: |
  (add1 -1) -> 0
  (add1 0) -> 1
  (add1 1) -> 2
  (add1 0.1) -> 1.1
  (add1 1.1) -> 2.1
...*/
